I would argue that it doesn't give desktop developers "access to the web's fantastic tooling and iteration speed," as the tooling and iteration speed for the web is crap compared to desktop. "Hot Reload" is kind of a poor substitute, as I still need to edit text that correlates with what I'm seeing instead of interacting with it directly. I can get something working in C++/Qt, PyQt5, WinForms/C#/.Net (windows) way faster†.

However, it does let people hit 4 platforms way quicker than even two, which is a huge deal. And while I'm working out the kinks in my Qt app, the Javascript dev has a version anyone with a browser can use on anything right away, even if the desktop version isn't ready yet.

†Pouring one out for HyperCard. I miss that wonderland.

Edit: Damn you auto-markdown.